A trough of low pressure off the SC coast spread moisture over a cold wedge of cold air, producing a cold rain over most of the area, with some ice being reported.
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The episode as NWS CHS wrote it up.
A trough of low pressure off the SC coast spread moisture over a cold wedge of cold air, producing a cold rain over most of the area, with some ice being reported.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Charleston, SC wrote its last area forecast discussion before the first event at Jan 18, 7:00 AM EST, 54 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE CHARLESTON SC
700 AM EST THU JAN 18 2007
.MARINE UPDATE...
SFC PRES GRAD STILL PINCHING CLOSER TO THE GEORGIA COAST EARLY
THIS MORNING...BUT RECENT OBSERVATIONS FROM SPAG1 SHOW THE COASTAL
TROF IS MAKING INROADS INTO OUR 20-60 NM GEORGIA LEG...REDUCING
GALES AS WINDS VEER AND PINCHING PACKS WNW TOWARD THE COAST. WE
HAVE UPDATED THE CWF TO LOWER GALE WARNING IN AMZ374 AND TOUCHED UP
ON INITIAL CONDITIONS.
TIDE DEPARTURES AT BOTH CHS HARBOR AND FORT PULASKI HAVE INCREASED
DRAMATICALLY OVERNIGHT BUT IT STILL APPEARS SHLW COASTAL FLOODING
CRITERIA WILL BE APPROACHED...BUT NOT EXCEEDED. WILL CONTINUE TO
MONITOR.
&&
PREVIOUS DISCUSSION
.SHORT TERM /TODAY THROUGH SATURDAY/...COMPLICATED START TO THE DAY
WITH WIDESPREAD PRECIPITATION ACRS ALL OF SC AND ERN GA WITH STRONG
FREEZING POTENTIAL. HIGH PRES WEDGE HOLDING STRONG IN THE UPSTATE
INTO THE MIDLANDS WHILE A COASTAL TROUGH CENTERED ABOUT 100NM
OFFSHORE OF KJAX CLOSES INTO A CLOSED LOW...FORCING STRONG
ISENTROPIC LIFT NWD OVER THE ENTRENCHED COLD AIR. SFC TEMPS NEAR THE
COAST AND S OF THE SAVANNAH RIVER GENERALLY IN THE MID 30S WHILE
TEMPS APPROACHING ORANGEBURG AND ALLENDALE ARE AT FREEZING. 06Z KCHS
RAOB SHOWED A DEFINITIVE FREEZING LAYER BETWEEN 500 AND 2000FT ABOVE
THE SFC THEN STRONG WARMING ABOVE THAT AS THE WARM CONVEYOR BELT OF
THE OFFSHORE LOW GATHERS IMPETUS. OBS NEAR KCAE ARE ALREADY SHOWING
FZRA AND THE TREND HAS BEEN SHIFTING SEWD SO FREEZING PRECIP...IF IT
ALREADY ISN/T OCCURRING...SHOULD SHIFT INTO NRN PORTIONS OF THE
CWFA. AM STILL EXPECTING TEMPS TO FALL CLOSER TO DEWPOINTS IN THE
UPR 20S RATHER THAN DEWPOINTS RISING TO TEMPS IN THE MID 30S.
THINKING IS STILL TO HAVE 0.20 TO 0.25 INCHES OF ICING ON VEHICLES
AND ELEVATED SURFACES SUCH AS TREES...POWER LINES AND BRIDGES ALONG
THE FAR NRN PORTIONS OF THE INLAND COUNTIES WITH CLOSER TO 0.10
INCHES ARND HIGHWAY 17A. WITH GROUND TEMPERATURES IN THE UPR 40S TO
50S...ICING ON ROADS IS NOT EXPECTED TO BE A WIDESPREAD PROBLEM BUT
SOME SECONDARY OR ISOLATED ROADS MAY HAVE A FEW PATCHES. ICING
PROBLEMS WILL DECREASE GOING TWD THE COAST AND ACROSS THE SAVANNAH
RIVER...BUT AM STILL CONCERNED FOR PORTIONS OF CHARLESTON COUNTY
PARTICULARLY ALONG A SUMMERVILLE TO RAVENEL CORRIDOR AND FOR FAR
INLAND PORTIONS OF SE GA. THEREFORE...WILL LEAVE ICE WARNINGS AND
FREEZING RAIN ADVISORIES IN PLACE AS THEY ARE CURRENTLY DELINEATED.
BY LATE MORNING...ENOUGH WARM AIR WILL WRAP AROUND AND BECOME
ENGULFED INTO THE LOW PRESSURE SYSTEM AND SPREAD NWD MAKING FOR ANY
FROZEN PRECIP TO BECOME ALL LIQUID. PRECIPITATION WILL HAVE A HARD
TIME SHUTTING DOWN BEFORE MID AFTERNOON BECAUSE OF THE DEEP MOISTURE
STREAMING IN FROM THE GULF COAST STATES. THE TIMING OF THE DEPARTURE
OF THE COASTAL LOW WILL PRIMARILY DETERMINE HOW EFFICIENTLY PRECIP
DWINDLES LATE TDA INTO THIS EVE...BUT HAVE DROPPED POPS FROM 100
DOWN INTO THE LIKELY AND CHC CATEGORIES BY LATE THIS AFTN. SHOULD
THE PRECIP END EARLIER THAN ANTICIPATED...DRIZZLE/FOG MAY BECOME
ISSUES WITH THE WARMER AIR AND INCRG DEWPOINTS. BY LATE TONIGHT...
ANY LINGERING PRECIP WILL BE IN THE FORM OF DRIZZLE/LIGHT RAIN AND
SHOULD CEASE ALTOGETHER BY MIDNIGHT. HAVE ADDED IN PATCHY FOG FOR
TONIGHT WITH VERY LOW DEWPOINTS DEPRESSIONS AND WINDS IN SOME SPOTS
DROPPING BELOW 5 KT.
AS FOR TEMPS TDA AND TNGT...AM HAVING A HARD TIME BELIEVING THE MAV
TEMPS BRINGING MAX TEMPS NEAR 50. THEN AGAIN...ITS PROG BRINGS THE
COASTAL LOW WELL INLAND WHICH SEEMS HIGHLY UNREASONABLE GIVEN THE
ANALYZED STRENGTH OF THE HIGH. HAVE RUN WITH THE MET MOS TEMPS WHICH
HOLD TEMPS IN THE UPR 30S TO LOWER 40S TDA...AND THESE SEEM MORE
REASONABLE AS THE NAM/WRF HOLDS THE COASTAL LOW OFFSHORE. AS THE
SYSTEM PULLS AWAY BUT LEAVES LIGHT PRECIP/THICK CLOUDS IN ITS WAKE
FOR TNGT...TEMPS FOR TNGT WILL NOT DROP MUCH FROM THE HIGHS TDA.
FRIDAY THROUGH SATURDAY STILL LOOKS TO BE A GOOD DRYING OUT AND
CLEARING OUT PERIOD AS HIGH PRESSURE APPROACHES...SFC WINDS SHIFT TO
NWLY AND MODEST UPR LVL RIDGING DEVELOPS W OF THE CWFA. TEMPS FOR
FRI THROUGH SAT REBOUND CLOSER TO NORMAL LEVELS.
&&
.LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/...HIGH PRES REMAINS
THRU SAT NIGHT THEN SHIFTS EWD SUN AS ANOTHER FRONTAL SYSTEM
APPROACHES FROM THE W. STILL SOME QUESTION AS TO THE EXACT PLACEMENT
OF THE WARM FRONT VERSUS THE LOW PRESSURE CENTER...SO ANOTHER
PROLONGED PERIOD OF RAINFALL MAY OCCUR SHOULD THE LOW PRESSURE
CENTER BECOME STRETCHED OUT ALONG A STATIONARY FRONT. WILL KEEP IN
CHANCE POPS FOR SUN NIGHT THROUGH TUE NIGHT. TEMPERATURES GENERALLY
LOOK TO REMAIN AROUND NORMAL.
&&
.MARINE...PINCHED GRAD IS LOCKED STRONG INTO OUR MARINE CWFA EARLY
THIS MORNING. GALE FORCE WINDS CURRENTLY OCCURRING IN OUR 20-60 NM
GEORGIA WATERS WITH IMPRESSIVE MIXING PROFILES HELPING TO PRODUCE
SEAS 13 TO 15 FT PER RECENT R2 TOWER OBSERVATIONS. GALE WARNING
EXTENDED THROUGH THE MORNING HOURS. WE INITIALIZED WIND SPEEDS
ELSEWHERE AT 25 TO 30 KT THIS MORNING AND WAS A BIT MORE PESSIMISTIC
IN DECREASING TREND FOR TODAY. WE EXTENDED SCA IN THE CHARLESTON
HARBOR THROUGH THE MORNING HOURS ON THIS PACKAGE.
WINDS SHOULD COME DOWN LATE TODAY AND TONIGHT...BACKING AROUND
TO A MORE OFFSHORE COMPONENT AS SFC PRES WAVE MOVES NE ALONG THE
W WALL OF THE GULF STREAM. SEAS WILL SUBSIDE FASTER NEAR THE
IMMEDIATE COAST AS THE FLOW GETS AROUND TO THE NW. SCA WILL LIKELY
LINGER INTO MUCH OF FRI FOR THE OUTER GEORGIA WATERS.
&&
.AVIATION /06Z-06Z/...CIGS TODAY WILL LIKELY REMAIN IN THE LIFR TO
IFR RANGE AT BOTH SAV AND CHS TERMS. WILL MONITOR FOR FREEZING RAIN
AT CHARLESTON AIRPORT THIS MORNING AS IT WILL BE A CLOSE CALL. WE
COULD SEE SOME NNE WIND GUSTS THRU LATE MORNING AS GRADIENT PINCHING
AFFECTS THE CAROLINA AND GEORGIA COASTS. DO NOT HAVE A GOOD FEELING
FOR VSBYS LATER TODAY AND THIS EVENING. GUIDANCE FROM MODEL SPREAD
VARIES GREATLY ON CHCS FOR SIGNIFICANT FOG DEVELOPING. WE HAVE
MAINTAINED AN IFR/MVFR VSBY PROG FOR NOW FOR BOTH TAF POINTS.
&&
.HIGH SURF/EROSION/TIDES...WE EXTENDED OUR HIGH SURF ADVISORY UNTIL
EARLY AFTN TODAY AS CONDITIONS ARE ACTUALLY JUST PEAKING THIS
MORNING. IT DOES NOT LOOK LIKE WE WILL SEE ANY PROBLEMS WITH SHLW
COASTAL FLOODING AT EITHER CHS OR SAV AT HIGH TIDE THIS
MORNING...EVEN THOUGH DEPARTURES ARE INCREASING WITH TIME.
&&
.CHS WATCHES/WARNINGS/ADVISORIES...
GA...FREEZING RAIN ADVISORY UNTIL 10 AM EST THIS MORNING FOR GAZ087-
088-099>101.
HIGH SURF ADVISORY UNTIL 1 PM EST THIS AFTERNOON FOR GAZ117-
119-139-141.
SC...FREEZING RAIN ADVISORY UNTIL 10 AM EST THIS MORNING FOR SCZ047-
050.
HIGH SURF ADVISORY UNTIL 1 PM EST THIS AFTERNOON FOR SCZ048-
051.
ICE STORM WARNING UNTIL 10 AM EST THIS MORNING FOR SCZ040-
042>045.
MARINE...SMALL CRAFT ADVISORY 330-350-352-354-374.
&&
JPC/24HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE CHARLESTON SC 700 AM EST THU JAN 18 2007 AMZ330-350-352-354-374-GAZ087-088-099>101-114>119-137>141-SCZ040- 042>045-047>051-191100- CHARLESTON HARBOR- WATERS FROM SOUTH SANTEE RIVER TO EDISTO BEACH SC OUT 20 NM- WATERS FROM EDISTO BEACH SC TO SAVANNAH GA OUT 20 NM- WATERS FROM SAVANNAH GA TO ALTAMAHA SOUND GA OUT 20 NM...INCLUDING GRAYS REEF NATIONAL MARINE SANCTUARY- WATERS FROM SAVANNAH GA TO ALTAMAHA SOUND GA EXTENDING FROM 20 TO 60 NM-JENKINS-SCREVEN-CANDLER-BULLOCH-EFFINGHAM-TATTNALL-EVANS- INLAND BRYAN-COASTAL BRYAN-INLAND CHATHAM-COASTAL CHATHAM-LONG- INLAND LIBERTY-COASTAL LIBERTY-INLAND MCINTOSH-COASTAL MCINTOSH- ALLENDALE-HAMPTON-INLAND COLLETON-DORCHESTER-BERKELEY-INLAND JASPER-BEAUFORT-COASTAL COLLETON-CHARLESTON-COASTAL JASPER- 510 AM EST THU JAN 18 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH CAROLINA... SOUTHEAST GEORGIA AND THE ADJACENT COASTAL WATERS FROM THE SOUTH SANTEE RIVER SOUTH CAROLINA TO ALTAMAHA SOUND GEORGIA. .DAY ONE...TODAY AND TONIGHT. .WINTER WEATHER...ICE STORM WARNINGS AND FREEZING RAIN ADVISORIES ARE IN EFFECT THIS MORNING ACROSS FAR NORTHERN PARTS OF INLAND SOUTHEAST GEORGIA AND MOST OF INLAND SOUTHEAST SOUTH CAROLINA. REFER TO THE LATEST WINTER WEATHER MESSAGE FOR ADDITIONAL DETAILS. .RIVER FLOODING...A RIVER FLOOD WARNING REMAINS IN EFFECT FOR MODERATE FLOODING ON THE LOWER SANTEE RIVER NEAR JAMESTOWN. REFER TO THE LATEST RIVER FLOOD STATEMENT FOR ADDITIONAL INFORMATION. .HIGH SURF/BEACH EROSION...A HIGH SURF ADVISORY REMAINS IN EFFECT THROUGH EARLY AFTERNOON FOR COASTAL LOCATIONS SOUTH OF EDISTO BEACH. BEACH EROSION IS POSSIBLE ACROSS ALL OF THE COASTAL AREAS AROUND THE TIME OF HIGH TIDE THIS MORNING. REFER TO THE LATEST COASTAL HAZARD MESSAGE FOR ADDITIONAL INFORMATION. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. .RIVER FLOODING...FLOODING WILL CONTINUE ON THE LOWER SANTEE RIVER NEAR JAMESTOWN THROUGH THE UPCOMING WEEK. REFER TO THE LATEST RIVER FLOOD STATEMENT FOR ADDITIONAL INFORMATION. .SPOTTER INFORMATION STATEMENT... SKYWARN SPOTTER ACTIVATION WILL NOT BE REQUIRED TODAY AND TONIGHT.
The national radar mosaic for the moment the first event began.
1 winter weather. Local standard time, as filed.
A light coating of ice was reported on power lines, trees, and brick steps near highway 24.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Georgia in 2007Every state in 2007This day in weather historyWarnings in Georgia, January 2007
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 9411.